update dependencies

update docker tag names

Use Github Container Registry

Also publish docker images on ghcr.io

support AllowIPs for peers in server config (h44z#24)

ensure that email attribute is set

include tag version in travis builds

version 1.0.6, show version in footer

Merge pull request h44z#7 from h44z/interface_types

Interface types and more...

update readme, fix default env file

fix potentially unsafe external link